I dont think Smartshooter is the problem. I have 60 cameras connected to a single laptop and smartshooter and it works very reliably.
As ttoke asked, what kind of hubs and cables do you use? That is very important. You have to use some powered hubs if you are going long distances with the cables, you have to use really good quality hubs and cables.
What operating system do you have in the computers and since there are many of them, are they all the same operating system?
Also are al the cameras the same model or many different ones?
Leo